Omnibox: In UMA logs, record typed_count of URLS.

chrome/common/metrics/proto/omnibox_event.proto

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Stores information about an omnibox interaction.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
@@ skipping 70 matching lines @@
     HISTORY_QUICK = 3;     // Matches for recently or frequently visited pages
                            // in history
     SEARCH = 4;            // Search suggestions for the default search engine
     KEYWORD = 5;           // Keyword-triggered searches
     BUILTIN = 6;           // Built-in URLs, such as chrome://version
     SHORTCUTS = 7;         // Recently selected omnibox suggestions
     EXTENSION_APPS = 8;    // Custom suggestions from extensions and/or apps
   }
 
   // The result set displayed on the completion popup
+  // Next tag: 6
   message Suggestion {
     // Where does this result come from?
     optional ProviderType provider = 1;
 
     // What kind of result this is.
     // This corresponds to the AutocompleteMatch::Type enumeration in
     // chrome/browser/autocomplete/autocomplete_match.h
     enum ResultType {
       UNKNOWN_RESULT_TYPE = 0;    // Unknown type (should not reach here)
       URL_WHAT_YOU_TYPED = 1;     // The input as a URL
@@ skipping 11 matching lines @@
                                   // engine)
       SEARCH_OTHER_ENGINE = 10;   // A search with a non-default engine
       EXTENSION_APP = 11;         // An Extension App with a title/url that
                                   // contains the input
     };
     optional ResultType result_type = 2;
 
     // The relevance score for this suggestion.
     optional int32 relevance = 3;
 
+    // How many times this result was typed in / selected from the omnibox.
+    // Only set for some providers and result_types.  At the time of
+    // writing this comment, it is only set for HistoryURL and
+    // HistoryQuickProvider matches.
+    optional int32 typed_count = 5;
+
     // Whether this item is starred (bookmarked) or not.
     optional bool is_starred = 4;
   }
   repeated Suggestion suggestion = 9;
 
   // A data structure that holds per-provider information, general information
   // not associated with a particular result.
   message ProviderInfo {
     // Which provider generated this ProviderInfo entry.
     optional ProviderType provider = 1;
 
     // The provider's done() value, i.e., whether it's completed processing
     // the query.  Providers which don't do any asynchronous processing
     // will always be done.
     optional bool provider_done = 2;
   }
   // A list of diagnostic information about each provider.  Providers
   // will appear at most once in this list.
   repeated ProviderInfo provider_info = 12;
 }